N-(6-methyl-6-ol-2-heptyl)-n{40 -substituted piperazines

ABSTRACT

Piperazines of the formula IN WHICH R is a straight or branched chain alkyl radical, which may be substituted by a hydroxyl, of one to seven carbon atoms, a cinnamyl radical, or a radical of the formula IN WHICH Z is hydroxy, alkoxy or a heterocyclic radical. The compounds are prepared by alkylating an N substituted piperazine with 2-bromo-6-methyl 5-heptene and then hydrating the reaction product in a sulfuric acid medium. The compounds may be incorporated with therapeutically acceptable carriers to make compositions exhibiting analeptic cardio-vascular effects.

nited States Patent Raynaud et al.

Foret; Gerard J. Huguet, Malesherbes, all of France Assignee: Delalande S.A., Regnault, France Filed: April 13, 1970 Appl. No.: 28,057

[30] Foreign Application Priority Data April 22, 1969 France ..6912510 US. Cl ..260/247.5 R, 260/240 K, 260/268 R, 260/268 H, 424/248, 424/250 Int. Cl. ..C07d 51/70 [56] References Cited UNITED STATES PATENTS 3/1971 Fauran et al 260/240 OTHER PUBLICATIONS Morrison et al., Organic Chemistry 2nd Edition, Allyn and Bacon, Inc., Boston, Mass. (1966), pp. 188- 189.

Field of Search ..260/240 K, a

268 R, 268 H, 247.7 5,260/2475 R 51 Oct. 3, 1972 Primary Examiner- Henry R. J iles Assistant Examiner-G. Thomas Todd Attorney-Woodhams, Blanchard and Flynn 57] ABSTRACT Piperazines of the formula in which R is a straight or branched chain alkyl radical, which may be substituted by a hydroxyl, of one to seven carbon atoms, a cinnamyl radical, or a radical 9f the @5 9? in which Z is hydroxy, alkoxy or a heterocyclic radica].

The compounds are prepared by alkylating an N substituted piperazine with 2-bromo-6-methyl S-heptene and then hydrating the reaction product in a sulfuric acid medium.

The compounds may be incorporated with therapeutically acceptable carriers to make compositions exhibiting analepticcaliwl scugreffigt N-(6-METHYL-6-OL- Z-HEPTYIJ-N '-SUBSTITUTED PIPERAZINES The present invention relates to novel N-( 6-methyl- 6-ol-2-heptyl)-N'-substituted piperazines, their process of preparation and their therapeutic utilization.

The novel piperazines of the present invention correspond to the general formula:

011 om-c-oHr-oHrcHrcrr-m-R H Hi in which 2 represents a hydroxy radical, an alkoxy radical or a heterocyclic radical.

The process for preparing the compounds according to the present invention comprises hydrating, in a sulfuric acid medium, a N-(6-methyl-2-hept-5-enyl)-N'- 35 substituted piperazine of the general formula:

CHa CH1 (2) CHa-C-CH-CHs-CHz-CH-N N-R H-N' ii-R in which R has the same significance as in formula (1), with 2-bromo-6-methyl-S-heptene of formula:

The following preparations are given by way of nonlimitative examples to illustrate the present invention.

EXAMPLE 1 N-(6methyl-6-ol-2-heptyl )-N'-methyl piperazine dihydrochloride.

0.6 mole of N-methyl piperazine and 0.66 mole of 2- bromo--methyl-S-heptene are dissolved in 400ml. of methyl-arnyl-ketone, and 90g. of sodium carbonate is added thereto. The mixture is then refluxed for hours. Thereafter, 10 percent hydrochloric acid is added to the mixture. The aqueous phase is decanted, alkalinised and extracted with ethyl acetate. After concentration, the crude product is purified by distillation. The N-(6-methyl-2-hept-5-enyl)-N'-methyl piperazine boils at 100 C under 005mm. Hg.

This compound is dissolved in 150 ml. of percent sulfuric acid and the mixture is agitated at C for 5 hours. Thereafter, concentrated soda is added to render the reaction mixture alkaline, and extraction is effected with ether. After elimination of the solvent, a

crude product is obtained which distills at 136 C under 0.1mm. Hg.

By bubbling hydrochloric acid gas through a solution in acetone of the N-( 6-methyl-6-ol-2-heptyl)-N'- methyl piperazine formed, the dihydrochloride is obtained.

Melting point 225 C (with decomposition) Yield 7 1 percent Empirical formula= C aHgoClzNg 0 Elementary analsis:

Ca lculated, C: 51.82; H: 10.04; Cl: 23.54; N:9.30

Found, C: 51.94; H: 10.25; C]: 23.29; N: 9.13

EXAMPLE 2 N-(6-methyl-6-ol-2-heptyl)-N'-)pyrrolidino carbonylmethyl)piperazine dihydrochloride 0.3 mole of N-(pyrrolidinocarbonylmethyl)pipera zine, 0.33 mole of 2-bromo-6-methyl-5-heptene and g. of sodium carbonate are added to 200 ml. of methyl-amyl-ketone. After 9 hours under reflux, 300 ml. of water acidified with hydrochloric acid is added. The aqueous phase is alkalinised after decantation and extracted with ethyl acetate. The solvent is removed and the product obtained is distilled. The N-(6-methyl- 2-hept-5-enyl)-N'-(pyrrolidinocarbonylmethyl)pipera zine formed boils at 205 C under 0.1mm.1-lg.

This compound is treated with 100 ml. of 33 percent sulfuric acid at 45 C for 5 hours. After addition of soda, extraction is effected with ethyl acetate. The dried solution is treated with hydrochloric acid gas and the precipitate of N-(6-methyl-6-ol-2-heptyl)-N-(pyrrolidinocarbonylmethyl)piperazine dihydrochloride formed is dried and crystallized in an acetone-water mixture.

Melting point 200 C Yield=% Empirical formula C H Cl N O J-l O Elementary analysis:

Calculated, C: 51.91; H: 9.44; Cl: 17.03; N: 10.09

Found, C: 52.04; H: 9.24; Cl: 16.76; N: 9.89

The compounds listed in the following table have been prepared according to the preceding examples:

-CH:CO-N OHzCON -CH:-CH=CH It --CH CH1OH CH2COOC2H5 Compounds of Formula Boiling point,

C./ mm. Hg, 145-150/0. 3 212/0. 3 195/200/0. 2 141/0. 1 165/0. 3 Salt 2HCl ZHCl (|JHCOOH 21101 2 (fHCO0H BHCOOH EH-COOH Melting point, C 230 216 160 190 196 Yield,

percent 60 50 48 51 65 Compounds Formula Empirical formula. CuHuClzNzO: CmHuClzNaOz CzaHuNaOn CnHuClzNzOs CnHqzNzOo Analysis The compounds of formula (1) exert analeptic carng between 10 and 500 mg. by in fl o dio-vasculary effects on laboratory animals as can be t a uscular 0 Oral meansevidenced by treating an animal made weak by Accordingly, the present invention also comprises a haemorrhage. This effect is shown by an increase in the therapeutic cQmPOSitiOII comprising a piperazine of the arterial pressure. general formula 1) together with a therapeutically-ac- The results of practical tests on a certain number of ceptable compounds of formula (1), as well as the toxicity what We Clalm 15: thereof, are listed in the following table: QQ QPQEQQQQ Q f m R Toxicity Tensional CH Activity I CHz-(f-CHr-CHz-CHz-CH-N N-R (1) 40 0H CH3 Means Approx- Active Of dose adminimate adminisdurai hi h R i istration LDSO tered by tion mm of a linear or branched-chain alkyl radical having one action to seven carbon atoms; vcmous a linear or branched-chain alkyl radical having one means to seven carbon atoms and substituted by a hydroxy radical; -cH intra- 500 mg/kg 10 mg/kg 30 mm a cmllamyl radlcal' or venous a radical of formula: oral 2g/kg s -CH c-z cH,-co oral 2 g/kg 20 mg/kg 5 mn CH CO- oral 1850 mg/kg 10 mg/kg 50n1n ,v in which Z represents hydroxy, ethoxy, pyrrolidino, Ch .CH OH mm 430 mg/kg morpholino or hexamethylenimino,

venous and the pharmaceutically acceptable nontoxic acid 7 g/kg mg/kg addition salts thereof. x 2. A com ound accordin to claim 1 in which R is CH CO intra- 980 mg/kg methyl p g venous 0 oral 1,100 mg/kg 20 mg/kg 10 mn 6 3. A compound according to claim 1 111 which R 18 pyrrolidino carbonylmethyl.

4. A compound according to claim 1 in which R is hexamethylenimino carbonylmethyl.

As a result of the above, the therapeutic coefficient A Compound according to claim 1 in which R is of the novel piperazines of the present invention is sufmorpholino carbonylmethylficiently great to enable the piperazines to be employed A Compound according to Claim 1 in which R is as medicaments in the treatment of cardiac diseases. y y y They may be administered to humans in doses compris- UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. 3 696 100 Dated October 3 1972 InVentor(s)Guy M. Raynaud, Claude P. Fauran, Michel J. Turin,

Bernard M. Pourri as, Gerard J. Huguet It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

The formula of Claim 1 should read as follows:

Signed and sealed this 13th day of March 1973 (SEAL) Attest:

EDWARD M.FLETCHER,JR.

ROBERT GOTTSCHALK Attesting Officer Commissioner of Patents FORM PO-105O (10-69) USCOMM-DC 60376-1 69 u.s. GOVERNMENT PRINTING OFFICE: I969 0-366-334 

2. A compound according to claim 1 in which R is methyl.
 3. A compound according to claim 1 in which R is pyrrolidino carbonylmethyl.
 4. A compound according to claim 1 in which R is hexamethylenimino carbonylmethyl.
 5. A compound according to claim 1 in which R is morpholino carbonylmethyl.
 6. A compound according to claim 1 in which R is hydroxyethyl. 